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usually we are using public-key encryption, or functional encryption along with ECDSA signatures to provide message authenticity and integrity in Ad-hoc networks, but both these techniques have inherent drawbacks, what else can we use to improve the message authenticity and integrity in ad-hoc networks.

Sandhya Kohli
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  • are there any constraints besides ad-hoc networks, like none of the comunicating parties had contact before, no trusted third party, etc? – DarkSquirrel42 Apr 24 '17 at 10:07
  • i am asking this with respect to Vehicular Ad-Hoc Networks, so these constraints are the part of VANET, communicating nodes will be V2V or V2I, and there will be a trusted authority also. – Sandhya Kohli Apr 25 '17 at 07:29

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regarding "without using traditional methods of encryption and digital signatures", i can not say the following more clearly:

STOP ... right here... right now ...
when we are talking about vehicular data exchange the cryptographic needs are mission critical. when you ask about what can be done without well established methods, you are thinking about breaking rule number one in cryptography: designing your own system.

you do not want your own crypto system / protocol ... you want a well tested, reliable, publicly available, system that has been audited by the crypto community

DarkSquirrel42
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  • thanks sir. could you suggest me if i am using encryption in VANET, and i want to use, Hidden Vector Encryption, instead of public key encryption and identity based encryption. how can i compare the performance of IBE and HVE. – Sandhya Kohli Apr 25 '17 at 08:15